° 
ACKNOWLEDGEMENT 
performed during 
sponsorship in- 
Manned Spacecraft 
The works reported in this paper were 
the last four years under seyeral sources of 
cluding the Mapping Science Laboratory, NASA 
Center, Houston, Texas; the University of Illinois Research 
Board; and the U. S. Geological Survey. Special appreciation 
is extended to the following graduate students who have assisted 
in mensuration and data processing: 
Eugene V. Gamble, and Robert E. Riggins. 
Messrs. Clement C. Lee,